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Cement Curing Autoclave User Manual
100072577
Revision H
1
1 Introduction
1.1
Cement Curing Autoclave
The Cement Curing Autoclave is an apparatus used to cure cement slurry
samples under elevated hydrostatic pressure and temperature. The cement
slurry samples are contained in one or two 2 inch cube molds, surrounded by
water (or oil), within the pressure chamber. The autoclave includes a heating
jacket which completely surrounds the cement curing pressure chamber,
temperature controller, thermocouple, pressure gauge, adjustable pressure
regulator, and manual fill and bleed valve.
The Cement Curing Autoclave requires an external pressure source, such as
compressed nitrogen gas or a hydraulic pump, capable of providing pressure
up to 3,000 PSI.
1.2
Function
The Cement Curing Autoclave cures cement slurry samples under elevated
pressure and temperature to prepare them for destructive compressive-strength
tests. These tests help determine compliance to American Petroleum Institute
(API) Specification 10A,
Specification for Cements and Materials for Well
Cementing
. This device meets the requirements for pressurized cement curing
equipment found in API Specification 10A, and API Recommended Practice
10B,
Recommended Practice for Testing Well Cements
.
After the curing period, the samples are removed from the single-cube molds
and tested to determine their compressive strength.
The pressure relief valve prevents the pressure chamber from exceeding 3,000
PSI (20.7 MPa).
The desired temperature for curing the cement samples is set on the
temperature controller, which automatically maintains that temperature
throughout the curing period. The maximum recommended curing
temperature is 400 Degrees F (204 Degrees C). A thermostat in the heating
jacket is set for an upper limit of 450 Degrees F (232 Degrees C) for safety.
The practice of removing the curing chamber and cooling it under
water is very dangerous. It is not recommended because of the
danger of severe burns if touched or accidentally dropped. Also
use extreme caution when placing a hot chamber in water. Hot
steam generated when the water hits the hot chamber can cause
severe burns.